> Is it a "positional" hierarchy like -O2 -march=i586
> or a "optimization" hierarchy -O3 -march=i686 ?
I believe it is positional in the sense that the last option is used. In
your case, that would be -O3 and -march=i686.
With "-O1 -O3 -O2 -march=i386 -march=i686 -march=athlon" you would wind up
with a moderately optimized (-O2) binary compiled for AMD Athlon processors
(-march=athlon).
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aster
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